asymmetric keratoconus definition
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Keratoconus |- !align=right | Contributing Editors: |. |-. Keratoconus is a common corneal disorder where the central or paracentral cornea undergoes progressive thinning and steepening causing irregular astigmatism.arly signs of Keratoconus include: • Asymmetric refracive error with high or progressive astigmatism. • Keratometry showing high astigmatism and irreguality (axis that do not add to 180 degrees). • Scissoring of the red reflex on ophthalmoscopy or retinoscopy.
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cicatricial ectropion See ectropion; therapeutic soft contact lens; orthopaedic spectacles; tarsus; trichiasis. cicatricial entropion; involutional entropion See entropion. congenital e. A rare congenital inversion of the eyelid usually associated with tarsal hypoplasia or microphthalmia.
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Crouzon syndrome An autosomal dominant condition (OMIM:123500) characterised by craniosynostosis causing secondary defects of facial bones and structures, including hypertelorism, exophthalmos and external strabismus, parrot-beaked nose, short upper lip, hypoplastic maxilla, and a relative mandibular prognathism. Molecular pathology.
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- Asymmetric hydrogenation is a chemical reaction that adds two atoms of hydrogen preferentially to one of two faces of an unsaturated substrate molecule, such as an alkene or ketone.ne of these is in the asymmetric hydrogenation of N-unfunctionalized imines to give primary amines. Such species can be difficult to selectively reduce because they tend to exist in complex equilibria of imine and enamine tautomers, as well as (E) and (Z) isomers.
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Socialization Group socialization Group socialization is the theory that an individual's peer groups, rather than parental figures, influences his or her personality and behavior in adulthood.Adolescents spend more time with peers than with parents.econdary socialization Secondary socialization refers to the process of learning what is the appropriate behavior as a member of a smaller group within the larger society. Basically, it is the behavioral patterns reinforced by socializing agents of society.
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exotropia That type of strabismus in which the visual axes diverge; may be paralytic or concomitant, monocular or alternating, constant or intermittent. Synonym(s): divergent squint, divergent strabismus, exodeviation (2) , external squint, wall-eye (1)
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Corneal Disease This disorder--a progressive thinning of the cornea--is the most common corneal. dystrophy in the U.S., affecting one in every 2000 Americans. It is more prevalent in teenagers and. adults in their 20s. Keratoconus arises when the middle of the cornea thins and gradually bulges. outward, forming a rounded cone shape. This abnormal curvature changes the cornea's refractive. power, producing moderate to severe distortion (astigmatism) and blurriness (nearsightedness) of. vision.
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acanthosis adj., adj acanthot´ic. acanthosis ni´gricans diffuse acanthosis with gray, brown, or black pigmentation, chiefly in the axillae and other body folds, occurring in an adult form, often associated with an internal carcinoma (called malignant acanthosis nigricans) and in a benign, nevoid form, more or less generalized.
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- Estimates of the prevalence for keratoconus range from 1 in 500 to 1 in 2000 people, but difficulties with differential diagnosis cause uncertainty as to its prevalence. It seems to occur in populations throughout the world, although it is observed more frequently in certain ethnic groups, such as South Asians.
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asymmetric communications In some situations, asymmetric communications is not satisfactory. An example is two-way, full-motion videoconferencing, in which broadband data must flow in two directions between two end users. Another example is File Trasfer Protocol (FTP) applications in which the volume of upstream data is considerable.
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- 6) In a report to the New York Ophthalmological Society in 1912, Knapp noted that some patients who underwent cataract surgery later manifested clinical signs of dystrophia epithelialis with stromal and epithelial oedema, as described by Fuchs; (7) this is now known as pseudophakic bullous keratopathy (PBK), which is a complication of cataract ...
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Keratoconus The topographical map indicates any distortions or scarring in the cornea, with keratoconus revealed by a characteristic steepening of curvature which is usually below the centreline of the eye. The technique can record a snapshot of the degree and extent of the deformation as a benchmark for assessing its rate of progression.
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Keratoconus Causes, Symptoms And 10 Treatment Options In the mildest form of keratoconus, eyeglasses or soft contact lenses may help. But as the disease progresses and the cornea thins and becomes increasingly more irregular in shape, glasses and regular soft contact lens designs no longer provide adequate vision correction. Normal eye vs. eye with keratoconus. The keratoconic cornea bulges slightly, for a more cone-shaped surface.
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What is Sicca Syndrome? 1 Sicca Syndrome: WHAT: Keratoconjunctivitis sicca. 2  Keratoconjunctivitis Sicca (KCS): an eye condition in which there is decreased tear production and inflammation of the cornea and conjunctiva. 3  WHY: Keratoconjunctivitis sicca is found in a significant number of patients with rheumatoid arthritis. KCS plus xerostomia is called the sicca syndrome. 2  The association of the sicca syndrome with rheumatoid arthritis is known as Sjogren's syndrome. 3  HOW: Clinically, patients with KCS may present with itching, burning eyes.
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strabismus comitant strabismus (concomitant strabismus) that in which the angle of deviation of the visual axis of the squinting eye is always the same in relation to the other eye, no matter what the direction of the gaze; due to faulty insertion of the eye muscles.convergent strabismus esotropia.omitant strabismus (concomitant strabismus) that in which the angle of deviation of the visual axis of the squinting eye is always the same in relation to the other eye, no matter what the direction of the gaze; due to faulty insertion of the eye muscles.
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Astigmatism Defined The cornea of a normal eye is curved like a basketball, with the same degree of roundness in all areas. An eye with astigmatism has a cornea that is curved more like a football, with some areas that are steeper or more rounded than others. This can cause images to appear blurry and stretched out.
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asymmetric communications For an example of asymmetric communications, see Asymmetric Digital Subscriber Line . In telecommunications, the term asymmetric (also asymmetrical or non-symmetrical) refers to any system in which the data speed or quantity differs in one direction as compared with the other direction, averaged over time.
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ASYMMETRIC ASYMMETRIC Dictionary entry overview: What does asymmetric mean? • ASYMMETRIC (adjective) The adjective ASYMMETRIC has 1 sense: 1. characterized by asymmetry in the spatial arrangement or placement of parts or components Familiarity information: ASYMMETRIC used as an adjective is very rare.
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SKIN CANCER An actinic keratosis, also known as a solar keratosis, is a scaly or crusty growth (lesion). It most often appears on the bald scalp, face, ears, lips, backs of the hands and forearms, shoulders, neck or any other areas of the body frequently exposed to the sun.
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- An autosomal dominant condition (OMIM:123500) characterised by craniosynostosis causing secondary defects of facial bones and structures, including hypertelorism, exophthalmos and external strabismus, parrot-beaked nose, short upper lip, hypoplastic maxilla, and a relative mandibular prognathism.
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Asymmetry Asymmetry. Definition. noun. The lack or absence of symmetry. Supplement. In biology, the body plan of many organisms exhibit symmetry. Although the parts in a dividing plane or around an axis are not exactly the same, there is a significant correspondence in form, size, distribution, or arrangement of parts.
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dry eye Keratoconjunctivitis characterized by decreased tear flow and thickening and hardening of the cornea and conjunctiva. Also called dry-eye syndrome, keratoconjunctivitis sicca.
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Keratoconus Corneal hydrops due to keratoconus. In advanced cases, bulging of the cornea can result in a localized rupture of Descemet's membrane, an inner layer of the cornea. Aqueous humor from the eye's anterior chamber seeps into the cornea before Descemet's membrane reseals.eratoconus (KC, KTCN) (from Greek: kerato-horn, cornea; and konos cone) is a degenerative disorder of the eye in which structural changes within the cornea cause it to thin and change to a more conical shape than the more normal gradual curve.
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Keratoacanthoma â Pictures, Symptoms, Causes, Treatment Keratoacanthoma or KA is a skin growth that is reasonably common and is swiftly growing. It typically appears as a dome-like lump on skin which is sun-exposed on light-skinned elderly as well as middle-aged individuals.It is frequently found at sites of prior trauma or injury. Many researchers believe that keratoacanthomas is the less severe type of “squamous cell carcinoma”.Most keratoacanthoma cause only nominal injury to the skin but some do act more antagonistically and can spread to lymphatic nodes.t typically appears as a dome-like lump on skin which is sun-exposed on light-skinned elderly as well as middle-aged individuals. It is frequently found at sites of prior trauma or injury. Many researchers believe that keratoacanthomas is the less severe type of “squamous cell carcinoma”.
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- Keratoconus (Definition) Keratoconus is a condition where the cornea bulges forward, leading to distorted vision. While keratoconus can start in childhood, it can also develop later in life. Eye rubbing is a known risk factor.
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asymmetric You describe something as asymmetric when it lacks the mirror-image quality of symmetry. That dress your sister sewed for you may appear stylishly asymmetric, but really the reason the sleeves are different lengths is because she doesn’t know how to use a tape measure. The a-prefix comes from Latin and makes a word into its opposite, so asymmetric is the opposite of symmetric. Asymmetric often describes an intentional part of a design, like a shirt with an asymmetric neckline.